Sportsman 800 Twin / gas in the oil - Polaris ATV Forum
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post #1 of 19 (permalink) Old 03-24-2017, 03:31 PM Thread Starter
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Sportsman 800 Twin / gas in the oil

Hi all, new to the forum. My '05 Sportsman 800 EFI is getting gas into the oil somehow. I found the oil level elevated (about 3/4" above the max line) and the oil was thin and smelled like fuel. I changed the oil/filter and confirmed a good oil level, added some SeaFoam and rode the bike for a while and it happened again after several short rides. The coolant level is not changing and the oil is not milky at all so I'm fairly certain it's fuel. The quad is used frequently for short trips and one of the plugs has been fouling faster than normal. I'm thinking I may have a fuel injector sticking open but I thought I'd run it by you folks to see if you have encountered this problem or have any suggestions. BTW, the bike runs strong with no loss in power until the plug fouls. Thanks in advance for any help.
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post #2 of 19 (permalink) Old 03-24-2017, 03:56 PM
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Sounds like a leaking injector.
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post #3 of 19 (permalink) Old 03-24-2017, 05:59 PM Thread Starter
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Yeah, I pulled the injectors, applied voltage and sprayed carb cleaner thru them. They seem to cycle OK as I cycle the voltage. I guess I'll put it back together, change the oil/filter again and finish running this tank of gas/SeaFoam thru it and keep a close eye on my oil level. Thank for the reply.
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post #4 of 19 (permalink) Old 03-24-2017, 07:12 PM
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Yes but when closed with pressure behind it, that's when it probably leaks.

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post #5 of 19 (permalink) Old 04-06-2017, 10:58 AM Thread Starter
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Changed the oil again, installed brand new fuel injectors and I'm still getting fuel in the oil. I'm scratching my head on this one.
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post #6 of 19 (permalink) Old 04-06-2017, 11:49 AM
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Did ya do a compression check? Possibly bad rings on that cylinder with the fouling plug.
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post #7 of 19 (permalink) Old 04-06-2017, 01:19 PM
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Quote:
Originally Posted by Oilboiler View Post
Changed the oil again, installed brand new fuel injectors and I'm still getting fuel in the oil. I'm scratching my head on this one.
Sounds like bad/stuck piston rings to me, like another posted said do a compression check although it should run rough. If the compression is good then check the spark because it may not be firing in that cylinder all the time. Intermittent firing can cause the problem as well, but it should idle rough or run rough. I have seem the engine with a bad/failing coil foul plugs and run ok too, so check your spark as well. A intermittent sticking valve could do something like this too, so a compression check.

Also your fuel injectors are electronic controlled, so check that as well.
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post #8 of 19 (permalink) Old 04-06-2017, 03:20 PM Thread Starter
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Thanks for the suggestions. The strange thing is the machine is running like a top. It runs as strong as it did when it was new. It idles smooth and throttle response is great. Spark tester indicates spark on both wires and the plugs are new with proper gap set. I'll check the compression on both cylinders and see if thats the issue. I sure hope it's not rings...
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post #9 of 19 (permalink) Old 04-17-2017, 09:32 AM Thread Starter
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Finally got around to testing the compression. I've got 168# on one cylinder and 148# on the other. Both hold pressure once I stop turning over the engine. The cylinder with the lower pressure is the cylinder that tends to foul plugs more quickly. From what I've found researching what the compression should be, my numbers look like they are within spec. I guess I'll try to test the coil and plug wires next. Any pointers are appreciated.
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post #10 of 19 (permalink) Old 04-19-2017, 01:41 PM Thread Starter
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Well, still trying to figure out how I'm getting fuel into the oil. I just replaced the ignition coil and plug wires with new (Dynatek). Spark and compression are good. New fuel injectors. So, after yet another oil/filter change I'm monitoring my oil level closely again. It runs like a scalded ape and idles smooth. Time will tell. I guess if it happens again it's time to dive into the motor...
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